Guido David Pelaez, MD
Hematology & Oncology Physician · Saint Louis, MO
Guido David Pelaez, MD is a hematology & oncology physician with a practice address in Saint Louis, Missouri, and NPI 1427792316, issued on Apr 26, 2022. Check the license (Missouri 2026027406, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Guido David Pelaez
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- 2026027406 MO
2022020315 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110
- Phone
- (314) 362-8065
- Enumerated
- Apr 26, 2022
- Record last updated
- Jul 13, 2026
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 237 in Missouri → Look up another NPI →
Also registered at 1 Barnes Jewish Hospital Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Guido David Pelaez in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2026027406Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
668 Medicare Part D claims for 75 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Gabapentin43 claims
- Amlodipine Besylate39 claims
- Atorvastatin Calcium37 claims
- Losartan Potassium28 claims
- Carvedilol26 claims
- Ozempic23 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Guido David Pelaez among 237 hematology & oncology physician records in Missouri
Guido David Pelaez, MD is one of 237 hematology & oncology physician records with a practice address in Missouri. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 98% of them.
- NPI issued2022 · 98% of these records are older, under 1% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileNo · 71% of these records are
- Record last updated2026 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Missouri
There are 237 hematology & oncology physician records in Missouri.
All 237 in Missouri → Every provider in Saint Louis → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Mark Fesler, MDSaint Louis, MO 631101235204066
- Thomas Fong, M.D.Saint Louis, MO 631101790812642
- Sagun Goyal, M.D.St Louis, MO 631101316032741
- Barbra Horn, M.D.Saint Louis, MO 631101295738961
- Bassel Jallad, MBBSSaint Louis, MO 631101124282306
- Gerald Linette, MDSaint Louis, MO 631101114943420
- Mudresh Mehta, MDSaint Louis, MO 631101982932083
- Steven Pincus, MDSaint Louis, MO 631101063420933
Common questions
What is Guido David Pelaez, MD's NPI number?
Guido David Pelaez, MD's National Provider Identifier (NPI) is 1427792316, issued on Apr 26, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Guido David Pelaez, MD located?
The NPPES record lists a practice address at 1 Barnes Jewish Hospital Plz, Saint Louis, MO, 63110. Phone: (314) 362-8065. Providers update this record themselves, so call before visiting.
How can I verify Guido David Pelaez, MD's license?
NPPES lists Missouri license number 2026027406, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Guido David Pelaez, MD prescribe under Medicare Part D?
In 2024, Guido David Pelaez, MD had 668 Medicare Part D claims for 75 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.